🚀 go-pugleaf

I am trying to port some fortran software to C that I wrote several
years ago to solve a problem involving multivariate nonlinear 
constrained minimization. I used a package developed at my old
department (Mech. Eng. at Ohio State Univ.) called OPTPAK. This 
package was derived from another earlier work of the same name. The
optimization code in this package is all in FORTRAN and has alot of
baggage from its long development life. 

I have searched the nets (netlib,archie,etc...) looking for C source
code to use in place of OPTPAK to solve such a problem but have not 
succeeded. I have looked at Numerical Recipes also- but the code for
multivariate nonlinear minimization is unconstrained (at least I think
that is the case :).

So my question is- Could some kind soul out in netland direct me to a
source for such code ? I would prefer something ftp'able but I can scan
a journal article in if the C code is included in it.

thanks for any and all help!

dwight